无法将字符串值从一个片段传递到另一个片段[重复]

Question

我知道有很多关于这个的问题，但没有一个能解决我的问题我想把一个字符串变量从一个片段传递给另一个片段，这是我做的代码。但是我得到了错误（我会显示错误）

从我做的第一个片段

Desc_1 ldf = new Desc_1 ();
Bundle args = new Bundle();
args.putString("YourKey", "YourValue");
ldf.setArguments(args);
getFragmentManager().beginTransaction().add(R.id.frame, ldf).commit();

我喜欢的第二个片段

public class Desc_1 extends Fragment {

    public Desc_1() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootview=inflater.inflate(R.layout.fragment_desc_1,container,false);

        String value = getArguments().getString("YourKey");

        Toast.makeText(getActivity(), value,
                Toast.LENGTH_LONG).show();

        return rootview;

    }
}

我犯了这样的错误

07-27 20:31:06.386 26816-26816/com.example.jaison.newsclient E/AndroidRuntime: FATAL EXCEPTION: main
   Process: com.example.jaison.newsclient, PID: 26816
   java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
       at layout.Desc_1.onCreateView(Desc_1.java:34)
       at android.support.v4.app.Fragment.performCreateView(Fragment.java:2239)
       at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1332)
       at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1574)
       at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1641)
       at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:794)
       at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2415)
       at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2200)
       at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2153)
       at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2063)
       at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:725)
       at android.os.Handler.handleCallback(Handler.java:815)
       at android.os.Handler.dispatchMessage(Handler.java:104)
       at android.os.Looper.loop(Looper.java:207)
       at android.app.ActivityThread.main(ActivityThread.java:5769)
       at java.lang.reflect.Method.invoke(Native Method)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:861)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751)

Answer 1

请检查此答案，以在片段之间传递值

https://stackoverflow.com/a/27626004/5065318

Answer 2

只需检查片段中的getArguments（）是否不为null，然后在大括号中添加代码

示例：

Bundle bundle_arguments = getArguments();
if(bundle_arguments != null) {
    // your code 
} 

Answer 3

试试这个：

Bundle bundle = getArguments();
if(bundle != null)
    String value = bundle.getString("YourKey");